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Legal trouble in paradise for Brian Austin Green and Megan Fox.

The husband and wife of nearly two years are the defendants in a new lawsuit alleging the violent assault of a photographer on the beach in Hualalai, Hawaii, last December.

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Documents at TMZ report that paparazzo Delbert Shaw was taking photos of Green, 38, and wife Fox, 25, frolicking in the sand and surf. Perturbed, the sexy couple allegedly began arguing with Shaw -- leading Green to begin "pummeling" Shaw, while "Friends With Kids" star Fox reportedly cheered him on throughout the beating.

Asking for unspecified damages, the lawsuit claims that Shaw suffered serious injuries, and that Green threw his iPhone into the ocean.

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Fox and Green's reps didn't return calls to TMZ.